Wrench



G. C. KOTRBA.

l WRENCH. APPLICATION FILED JULY121920.

Patentedv May 17, 1921.

- Skun W/TVESSS UNITED, STATES GEORGE e. KOIRBA, or

u "WEAVER, OE CHICAGO, ILLINOIS.

CHICAGO, ILLINOIS, AssIGNoR oi1 wREN'cI-I.

To @ZZ/whomzr't may cof/wem: y.

. Be it known that'- I; GEORGE C.' kommt, a citizen of the United States, and a resident of Chicago, in the county of CookV andv Statey Of'Illinois, have inventeda new and Improved vWrench, vof which the following is a description. w

'This invention relates to improvements in wrenches, an object of theL invention being to provide a wrench which 'will be capable of quick adjustment and at the same time capable of absolutely accurateadjustment so that it may be adjusted to fit any size nut.-

The principal difficulty with most wrenches which have a quicklyl adjustable movable jaw is that the two jaws cannot be made to conform to the shape of any size nut. There is always a bit of play in the movable jaw. My inventionv overcomes this fault.

A' further Objectis to provide a wrench which will be simple 'and strong in con,. struction and practical and durable .in use.

With these and other objects in View the invention consists in certain novel features of construction and combinations and arrangements of parts asv will be more Vfully hereinafter described andv pointed out in the Y claims.' e

In the Vaccompanying drawings- Figure 1 is a view in side elevation with parts broken away of my improved wrench;

Fig. 2 is a view in front elevation partly in section on the line 2-2 of Fig. 1;

Fig. 8 is a view in rear elevation;

Fig. 4 is a sectional view on the line 4-4 of Fig. 1. g

Referring in detail to the drawings my improved wrench comprises a shank .1, a xed jaw 2 on the end of the shank, a handle 3 which may be of any approved kind and may be secured on the shank in any approved manner, and a movable jaw 4 which is slidably mounted on the shank.

A'collar or boss 5 is located around the shank 1 adjacent the handle 3 and the boss 5 is made with a perforated lug 6, the perforation serving to guide an adjusting' screw 7.

The jaw 4 is made with an integral boss 8 which is recessed in its under face to provide mounting for the end of the screw 7.

The screw 7 is formed with an annular groove 9, and a pin 10 projected in the boss Y Specicaton ofLetteis Patent., Patnted May 17, 1921 l Application led July 12, '1920."`Seria1 No. 395,594. t

8 engages 1in thegroove ,9 permitting turn@ f ing movementof the rod but lockingthe vrod against' longitudinal movement.

The screw 7 constitutes in eii'ect a rack infaddition'to its "function as an adjusting screw and meshesfwith va pinion 11l mountedo'na pin 13 in 'a vrecess 12 in the" shank 1. A locking dog 14 is mounted inthe recessv 12 of shank land pivotally supportedl between its ends` on 'a pin 15. One end of the dog projects through a slot 12 in boss '5 as shown at 17 in convenient position for' operation, andthe inner end of the dog is pressed into engagement between the teeth of pinion 11 bymeans of a `spring 16. It will be readily seen that by movingthe dog 14 out of engagement with the pinion the operator may` grasp the Vmovable jaw` 4 and move'it quickly up or down on the shank."

When the dog 14 is released from the pinion 11 it permits a quick adjustment of the.

movable jaw, the screw 7 operatingas aA rack in engagement with pinion. This adjustment cannot be fixed exactly untiltlie pinion is locked by the dog, when the screwl can be turned as muchas desired to accurately make and hold the adjustment.

vTo facilitate thev turning of the screw I provide on the free end thereof a' milled enlargement 18 so thatafter the jaw 4 has been moved as close as possible to the nut, by its quick sliding movement, the'dog is permitted to lock the pinion and the screw 7 turned to further adjust the position lof the jaw, the pinion acting as 4a thread and engaging the threaded portion of the screw.

Theoperation will be readily understood. To engage a nut with Va wrench the operator grasps the wrenchwith one hand and operates the finger 17 to move the dog 14 out of engagement with the pinion 11. The

jaw 4 is moved to the desired position and,

the dog 14 is allowed to spring back into 4 locked engagement with the pinion. Y If further adjustment is necessary `itmay be had vby turning the screw 7 as above pointed out.

While I have illustrated apreferred embodiment of the invention, it is obvious that various slight changes and alterations might be made in the general form of the parts described without departing from my invention and hence I do not limit myself to the precise detailsset forth butconsider myself at liberty to make such slight changes and' alterations as fairly fall within the spirit and scope of the appended claims.

Having thus described inyinvention, I

claim l. A wrench comprising a shank, a fired jaw on the shank, a movable jaw on the shank, a `screw secured to the movable jaw,

va pinion mounted in the shankmeshing with n said screw and a spring-held dog normally locking the vpinion against movement.

2. A wrench comprising a shank7 a iiyxed jaw on the shank, amovable jaw on the shank, a boss integral withthe movable j aw,

held dog normally locking the pinion against movement, and means whereby said movable jaw "may be adjusted whether said pinion is locked or unlocked.

3. A wrench comprising ashank, a iiXed jaw tliereom a movable jaw thereon, a boss integral with the movablejaw7 a screw having rotary mounting in saidl boss and forming a rack, a perforated Xed boss on the shank forming a gnide for said screw7 a pinion mounted in the shank meshing with said screw, means for locking the-pinion against movement whereby said screw may be adjusted by a longitudinal and also. by aturning movement of screw vto controltheL position of said movableiaw. Y

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